Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e5799428b45e1c41f9a51bcc47875900ed9eb09686d86cbf70a674f1ee902cba:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16